Improved compound for extinguishing pikes



eefioem.

THOMAS DREW, OF NEWTON, ASS

IGNOR TO HIMSELF AND :TAMES P. BRIDGE, OF BOSTON, MASSACHUSETTS.

Letters Batent No. 85, 434, dated December 29, 1868.

IMPROVED COMPOUND FOR EXTINGUISHING FIRES.

m I The Schedule refez zedto in these Letters Patent and making pert ot'tne name.

I or compound that may be dissolved in water, and when its solution is thrown upon fire or flame, will extinguish the same much more efi'ectually and rapidly than water alone.

I have found y my experiments that sulphite (not sulphate) of soda and hyposulphite of soda are excellently well adapted to this purpose. I have also found that a compound made by mixing one or both of these salts with carbonate of ammonia is also a superior ex-- tinguisher of fire and flame.

I do not confine myself to any proportions of these substances, nor-to any particular means of conveying the solutions to the tire, whether bytpumps or otherwise; but I desire to secure to myself the benefits of thisutscoveryand result of my experiment.

I do notclaim the use of carbonate of am monia in solntion for extinguishing fires, nor do Ielaim the use of salts of ammonia in combination with other salts which, by

mutual reaction, would produce the carbonate of ammonia, as that is described in the patent of E. A.

Galbraith, August 4, 1868.

Having thus described. my invention,

Theapplication of sulphite and hyposulphite of soda, eithersinglyor mixed, and insolution with water,

as extinguishers of fires;

' THOMAS DREW. Witnesses.

AUGUSTINE J omts,-; .Lums Fnm.

I claim as new, 'nd desireto secure by Letters Pat- 

